Playing it right now. Music is very catchy, and I love what you've done with such simple graphics.
I LOVE that there's an in-game tutorial, with many jam games you have to jump back-and-forth from game to page to learn the controls.
That said, here's some advice to make those in-game control tutorials even better:
1- Only teach one mechanic at a time. Make the first room teach them WASD to move and right-click to take off, and NOTHING else. Second room can add left-click to attack with some easy targets. Third room does both together.
2- Use screen space for instructions instead of world space. When the player moves, the tutorial text should move with them. Maybe even have it re-appear when they pause.
I also love that you slow down time when holding right-click in the air. It's a nice level of polish.
But as I'm playing the game I wasn't sure what I was suppose to be doing, I vaugely remembered instructions to blow someone up at the beginning of the level, but the only other characters around couldn't be attacked.
Thinking that either the game was glitched or I misread something, I went back to the beginning (again, if these instructions were on the GUI and could be referenced later, it would be better) and happened to noticed the "blow them up" instructions were higher up and to the side. It was just a guess for me to try launching myself up there to find the actual enemies. So finding the main gameplay area seemed more like a secret than natural progression.
Final thing I'd say is that having both the player attacks and enemies being red made everything blend together. Following color theory, red/green would contrast better, or red/yellow/blue.