Wrote this on GameFAQs so I'll just paste here. Quick answer Buuhan: the demo is very restrictive. The first part is VERY early in the game and doesn't represent the depth of the gameplay. The second portion drops an unrealistically powerful team in your party to deal with the enemies and boss. Still missing another battle party member and some strategy options. For more see below.
Forest segment
I first speed-ran this and skipped cutscenes we'd already seen because I wanted to get as far as possible within 25 minutes. Was very disappointed when 4-5 minutes later it force-ended the demo. So I re-played and did just about everything other than go to Ding Dong Dell.
Notes you may find particularly informative:
-The glowing stones that restore your HP/MP in dungeons also let you save in the normal game.
-The manholes next to save stones that Drippy says you may be able to use one day is the way you swap out the Imajinns in your party once you are at the appropriate story point.
-I tried going backwards at the very start of the demo but the game didn't let me. This is not the case in the full version.
-This is extremely early in the game but having only one party member and one Imajinn really lets you focus on one thing at a time in battle. It should be clear how you can evade moves by putting distance in between you and enemies, and how the timing of attacks really matters.
Other comments:
Not much to do in this section and nothing new to see, but I liked the flavor of the translation of moves and text. Mitey's Miracle Attack is named well (Slash Dance). I thought it was great when I tried to enter the southern woods and Drippy scolded me, wondering if I knew how to read a map.
Volcano segment
I'll just post my comments in paragraph form here.
Very restricted segment because you're on a timer and it ends after the boss. All you can really do is a few encounters and the boss. The main thing I want to stress for this portion is that you have an exceedingly unrealistic party. They've stacked tons of late-game familiars on your party (you can't obtain pretty much any of them at that point in the game), some of which are 3rd-stage evolutions that you don't have the ability to evolve yet. Tokotocold in particular (weird name) is totally broken. Look at his evasion stat. You can send him out and have enemies missing him all day (except with unavoidable skills).
But furthermore, tons of the familiars they drop on you are water/ice type, which exploits the volcano and boss enemies, AND they are full of anti-fire equipment. They basically set this portion on easy mode. In fact it might ACTUALLY be on easy mode. That boss should be spamming Volcanic Roar a lot more often. Battle was much easier than I remembered. Plus in case it was still too hard for you, they put a Phoenix Tear in your inventory (super-good revival item that is not easy to obtain).
Imajinn name translations remain great (Sasquash haw haw). And the release team clearly has a sense of humor because they nicknamed your Mighty Mite "Veggy Mite."
General observations
I love the font they used for text. A lot of times it feels so rigid after playing in Japanese with its larger, rounded characters but this one was great. The voices and translation all satisfied me, though much less was available than I'd hoped. My only voice complaints are some of the beginning/end of battle lines. A few felt off.
I was also really disappointed that I couldn't check out any of the magic book pages in the demo. Wanted to see what they look like in English.