Really cute idea in general. Needs a lot of polish, but I like the overall idea of it.

The graphics are cute, as is the music, and the movement is not as clunky and slow as I've been led to believe.

That said, there are problems: no killzone on the bottom of levels means you can't die if you fall off the level, leading to the game just soflocking (a manual restart button would go a long way here). Also, maybe improving the game feel a little bit, with things like a gleaming effect on the crystals, a sound effect (and a slight increase in speed) for the dash, maybe some "poof" and dust effects for sliding and killing monsters? I dunno, I feel like the "feel" could be better.

Also, I think the hitboxes on the platforms should be rectangles. The way they are, sliding off the edge is a problem.

There are some bugs that other people already mentioned down here, and also, the checkpoints are nearly invisible against the background. Maybe give them some kind of outline?

Overall, though, a very cute showcase of what the engine is capable of.

You should check world 3. Quite a few of the platforms lack collision. Not sure if it's intentional or not, but even enemies are falling off the map with this. Lava at the end of the chase level in world 4 also has no hitbox.

Across all world. Numerous walls don't have collision, you can get out of bounds and skip parts of the level.

Nice game

Movement is clunky and slow, makes it pratically impossible to play. At style is nice.

abort(114). Build with -s ASSERTIONS=1 for more info.
This showed up when I tried playing the game

You can jump out of the level on world 2, by flying up with the jetpack to the left high platform. and you fall forever, so you have to wait for timer to run out or restart from the very beginning. need a restart option in ESC menu as well (to restart the current level)
either way, game is really nice. love the art style.