I've made an update - with a leaderboard :D it's the first time i made it for a game - but seems like uploading is disabled until Weekly Jam #3 ends.
It might have been a bad idea to submit to a jam where submission period ends much sooner than for the other ones...I can upload it next week this way. Still, fortunately the other jams will be in submission period so the upgraded version will be ready for the players.
I'm not sure what to do with the enemy count tho. If I limit it to let's say 60, the lag will go away - at least on PC - but the game gets a bit to easy while it should get more and more impossible to keep playing. I'll try to optimize the enemies first I think. Each of them uses the Navigation features of Godot with A Star algorithm to follow the player - and not collide with each other. I can imagine it dragging the framerate down.