I gotta respect doing everything yourself! The visuals are solid and stylish, especially the background and the UI. I'm not a big fan of the in-game music due to it being such a short loop. The main menu music works quite well though.
There's a lot of features here I don't usually see in game jam gams! Being able to save your progress is nice, as is being able to rebind your controls. Gamepad support would be nice though... even if it's not rebindable.
With respect to gameplay, I think the level design is kinda weak. The back half of the game is definitely a step up from the rest though.
I'm curious how you're supposed to traverse the large gap of spikes at the beginning of the final level? Simply dashing over the first set of spikes would lead me to falling into the 2nd, wider set of spikes after it. I ended up getting past it by falling into the first set of spikes, but dashing right before i hit the spikes. The edge of the platform stops your momentum, but still lets you walk into the platform instead of dropping you into the spikes.