Thanks for reviewing. I had several ideas for this game, just check its GitLab page.
Oh, the short levels was on purpose to see the Warp in action. There is a "level" variable that specifies how many and how strong the enemies can be which starts at 1 now so you'll see one tiny enemy and it increases slowly. The original game started and increased this by 10 and you hardly ever got to see the shop (after 10 levels). Plenty of stuff to balance out.
The enemies avoiding the center was an unintended side-effect of using the 0.8.5 version. I don't know what I did there.