This is one of those games that I feel should not be so fun as it is. At first, the visuals/presentation and sound feels like nothing that special, and the game-play itself is just a "move-towards-the-mouse-and-shoot" like many other jam-entries have done, but after playing it I feel you have really managed to create a very fun experience, with some nice solutions/mechanics to some common issues. The game really grew on me as I was playing. I am Impressed.
As mentioned, at first I thought the visual/style just felt a bit out of place, but when you take a closer look there is a surprising amount of details there, and its a style that grows on you (or at-least for me). Also like that the very strong neon colors actually made it clearer to play, especially because the game is rather fast. Also like the color-coding: green/yellow is good, and red/purple is bad, so it was clear what to avoid and what to collect.
The collection mechanic was a strike of genius honestly, the building of the ship is very satisfying, as it is INSTANT and you get a very clear result of every piece you collect. It helps give the player a direction/in-game-goal of what to do etc. Also, that you could even get a shooting upgrade made you feel more powerful (especially the backwards shoot, that really helps as you cant make any strafe movements with the mouse only controls).
Lastly, I think what sealed the game for me was the speed. Its fast (and short) and it needs to be, it does not overstay its welcome, it plays quickly and without nonsense, I get a great build-up of power even during the short play-duration as I play and a goal that's easy to understand.
If there is one thing however, is that you should maybe have had a hint of where the "exit" was, as its at the moment just a item that looks different from the rest. Also, you can open that things really fast, maybe make it a multi-layered door? so you need to collect at-least a few parts to get in.
Overall, a surprisingly fun game for such a simple concept.