It's really fun and creative and looks good too. The gameplay is also fun and it's fun to dodge the bullets. If you are planning to expand on this after GMTK I would suggest there should be some other stuff, to keep the player engaged. like after 1 min I got a bit bored and it was very easy to keep continuing. but when I found the edge of the map my interest spiked. just got something new. so for fun a when around all edges. but after that, there is nothing new to experience.. but it was a 2-day jam so of course. but if you want to expand on this in the future, as a player I would want more engagement and things to look forward to while playing.
Best of luck :)