A fun concept! I don't know if you've ever played the game Celeste, but it uses quite the similar blocks in some parts of the game, kind of reminded me of that.
As for the gameplay, it's quite precise in some areas, but that's a good thing imo, and I found it to be very enjoyable.
Also, if you're planning on continuing with game development after the jam, I have a few suggestions that I think will help a lot :>
I know this has been said before, but the game looks a bit blurry, it's not particularly a bad thing, but you can fix it really easily. Since you're using Godot, you can just change this under Project -> Project Settings -> Rendering -> Textures -> Here under Canvas Textures just set Default Texture Filter to Nearest, and it shouldn't look blurry anymore!
Jump Buffer and Coyote Time have also been mentioned, and I agree that these will make the platforming feel a lot more intuitive. These concepts may sound complex, but they really aren't, you can just look it up on Youtube, and you'll find plenty of tutorials to implement these, which'll probably take like 30 minutes or so.
Auto Tiling will help with level design and make it a lot less tedious, this you can also find tutorials just about everywhere on the internet and is very easy to implement in Godot.
I don't think not having these is a bad thing, but they will help your game a lot. For a first game especially this game is really well made :D