I completed the demo in literally 3 minutes, and overall, those 3 minutes were worth it. Give it a try; this game is as heavy as a short video, and in the future (as the developer says), it should be something worthwhile.
There's no plot or story other than a couple of sentences at the beginning. The entire gameplay consists of walking along a straight path (well, there are obstacles), and about three enemies jump out at you at a time, and you just have to kill them. Each takes about 20 seconds, even though you can damage them all at once. This happens several times. Simple platforming—jump over some acid and... The demo is complete. Nothing to complain about, except that the movement feels a bit too clunky. Also, it wouldn't hurt if the character rotated a little slower, with a delay.
By the way, CuteBakery. If you want to make a good platformer or Metroidvania, I'd recommend Intrusion 2, or maybe Intrusion 1. The second part is available on Steam or any pirated sites. I don't know why, but your game reminded me of her. If I were a developer like you, I'd definitely draw inspiration from these masterpieces. They were made by an indie developer just like you, and you should learn from him. I'm looking forward to your game's excellent soundtrack. Gd Lck