I like the concept, the gameplay and most part of the gameplay.
You said: "Please provide feedback or criticism, as well as any bugs you encounter!" so...
If you go down u can crash without time reaction, if u click the button "quit" the game crashes and it may have benn good idea if the ship move like a ship (with acceleration and rotation as controls)
Sorry if i have grammatical mistakes, i´m upgrading my english -Kaximau