Impressively done, it's always fun to upgrade and compare early game to end game.
There were some issue where the camera snaps to a certain rotation or the ships position/rotation change. A losing condition would also be nice to have. Maybe a way to build your ships faster or skip the process could be added, it was cool to see the process at first, but got a bit tedious at the end.
Outisde of those things, the rest of the game is great and it's very impressive that was created in such a short time.
Got max upgrades and the planet cracker destroying the planet was a satisfying endgame feature.