This demo is so good that I went out of my way to make an account, just so I can gush about how perfect it is. First of all, the pixel-art is impeccable. It's in that perfect spectrum, I find, between being detailed enough to be impressive without forsaking any cool design elements. Major SNES / NeoGeo level stuff here!
The story is decent, but what really steals the show is the gameplay. More specifically, the movement. Oh god, I could write a college thesis discussing just how meticulously smooth and buttery it is. It had a sense of discovery to it, all the while feeling like I was already well-equipped since the tutorial, and it felt like every single time I had a thought about "Oh, imagine they added this to the moveset, that'd be neat and fun", the game responded and I discovered that thing. Slides, rolling, dashing, stomps, you have it all! I felt like a damn acrobat playing this game!
The content on display here is not only packing in quality, but in quantity too! For the first demo (to my knowledge) of this game, four levels - each with multiple SM64-like missions - AND a multiplayer mode is more than enough to keep you entertained for a good while. I saw some people talk about some performance issues, but it works perfectly fine for me.
However, despite my introduction, nothing is perfect. Indeed, there are a few nitpicks. It may just be a skill issue on my end, but the collision is a bit unforgiving for the enemies. Especially when trying to stomp, it feels like there's very little to see. Plus, I'd prefer if the coins went behind the enemies. There were times, especially during the enemy battles, where there were too many coins to see where the enemies are which, in conjunction with the tight hitbox, usually left me damaged. And speaking of damage, the knockback could be tweaked a little. I think it goes a bit far and the "hurt" thing lasts for a little long, especially going down a slope.
These next two things aren't so much nitpicks as they are suggestions: Firstly, considering the focus on the RPG-like bigger health on enemies (which I think is cool, reminds me of Super Paper Mario!), perhaps a little healthbar could be helpful to indicate how many hits are needed. Again, this could be a skill issue from me so idk. Secondly, (albeit it could be a thing coming later for all I know), a shop would definitely be appreciated as to incentivise me to collect more of the money and "AG", especially during later missions where you're going through the same stage over again. However, all of these are relatively minor nitpicks, things that I picked out purely for the sake of fairness and I'd probably suck it up in practice.
In conclusion, OH MY GOD THIS GAME IS PERFECTION INCARNATE AND YOU OWE IT TO YOURSELF TO PLAY IT IF YOU ARE A FAN OF PLATFORMER GAMES IN ANY CAPACITY. That being said, I'm going to be looking forward to developments going forward. You've earned yourself a fan!
EDIT: Oh, did I forget to mention? Yeah, they just casually include Blackjack in the game. Like, straight Blackjack. I mean, that's just amazing in and of itself. A part of me wishes that the full game adds the option to bet on it, just to add more for the money incentivisation. It would be hilarious if you could use it as a viable grinding strategy for getting upgrades or new moves or items or whatever.