I liked this game. It's fairly simple, but that's what makes for a good game jam game in my experience. There are only two small suggestions I'd make:
1) There should ideally be a screen between completing the last level and returning the player back to the main menu. Just returning the player to the main menu can be somewhat confusing (I thought I might have bugged out the game when I first saw it), and having a simple screen that says something like "Congratulations on beating the game" can make a big difference.
2) Since the only controls are aim in a direction and move towards that direction, I would have mapped moving forward to more than just W. Space would be a good option, but more importantly, I'd suggest mapping left-click to move forward. This would have the benefit of, if you made an HTML build of the game, it would be playable on phones (as well as with computer touchscreens). Making the game playable on more kinds of devices and with different kinds of inputs is a convenient way of improving accessibility.
Otherwise, I really liked this game, and think it was extremely well made.