This feels like a good start. I played to 39 kills, and maxed out some upgrades.
The biggest thing that stood out to me were the controls. The ship rotated based on the mouse position, but instead of the front of the ship facing the pointer, it kept the pointer to starboard. This was very unintuitive, and even after I figured out how the rotation worked it still messed me up more than once. I'd much rather the ship head toward the mouse pointer. With the use of the keyboard for forward and reverse movement, it would be nice if you added A and D as an alternative input for rotation. There should probably be an option to disable using the mouse for rotation for those who want to use the keyboard for all movement, so that the mouse does not interfere while clicking to fire. Similarly, adding keyboard input for firing would be nice. If you added options for keyboard for both rotation and firing, then those who want to use just the keyboard could ignore the mouse. While the option to disable mouse would be nice for those who want to use keyboard only for movement and mouse for firing, having the option to just use the keyboard would make a disable mouse rotation setting less important.
On the island screen it was not immediately clear what was interactable. The buttons at the bottom looked like buttons, but the upgrades did not. It would be nice if there were hover effects for interactable items, and making them look more clearly interactable even without the hover. With my above suggestion of allowing keyboard only inputs, this screen would, ideally, also get some form of keyboard support. Being a shop screen, and the intended primary input being keyboard and mouse together, I'd consider this more of a nice to have and not needed. It would also be nice if the upgrades had an indication of how many you can get of each. On a related note, it would be nice to see the max for stats like health on the main UI as well. One issue I had on this screen was that it did not scale down to the default viewport size. When not in fullscreen mode, the buttons overlap and the upgrade text overlaps the background lines.
At some point the islands disappeared. It was shortly before I stopped playing. I'm not sure when as I only really paid attention to them when going there. I just suddenly saw the popup text for interacting with an island, but no island. I checked the mini-map and it looked like one should be there. I went to where another was supposed to be and got the same thing. It seemed like I could also pass and shoot right through where they should be. I was still able to interact with them.
I can't really rate this entry since I don't know what was updated for the Sprint. It would be helpful if you could edit the submission to include details on what was done for it.