You did a great job!
The game has some polish to it. I like the way the title screen, shop, and upgrades look. Mechanically the game works fine.
I did feel like it was missing a bit of pizzaz. It's a bit boring at the start. You could fix this by adding some kind of larger 1 at the end, or needing fewer bullets to kill them, or even just having fewer 1's in the first level.
It's just that i found that I could group them all together by running around in circles, and then it just took a bit to kill them all, and that wasn't super interesting.
The real interesting part of the game is the shop and buying things to kill 1's faster, so the sooner i can get to the meat of the game the better.
or not! I'm just one person, and maybe the pace is better for someone else!
Anyway, well done, pat on the back for finishing a game. I know it's not easy, especially working by yourself.