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Thanks for comment and suggestion jugDuke :D

I created a similiar issue here: https://bitbucket.org/RokKos/pico-8/issues/4/more-visible-arrows 

Do you have any idea or suggestion on how to improve this?

It would be nice if you can keep a check in your enemy spawning so no 2 enemies are created overlapping each other.

Yes, this is a cool suggestion. I will add some checks and conditions where you can spawn enemies.