There’s some room for improvement..
The controls were nice, I liked shooting the bullets to counteract them.
The text could use more than just an outline, like a dark lettering inside so that if bullets or enemies get in the way, it doesn’t become unreadable.
And maybe I’m the one who’s made an error, but I can’t figure out how to get in the portal. I’ve tried clicking on it, entering it, etc… Maybe make the entry method more clear?
The overall aspect of the game with the most room for improvement is the visuals. The human enemies just stood idle while sliding towards you, which is pretty weird. The player sprite and portal are also quite strange, since they all use different resolutions, and seemingly a lot of them aren’t even in the same asset pack. I also found your chosen palette to be quite.. bad, it literally hurt my eyes while I was playing.
If the palette were changed, and the portal worked, I’d give it a 6/10.