I just found out, that in higher levels (at about level 24) the game spawns so many enemies that they start killing each other outside of playable area and the level then starts to rise exponentially. I rose from level +-24 to level 500 in about a minute and the lag was awful...
Oh, and no enemies spawn from the bottom off the screen... I call that a feature :)
After the jam ends, I try to fix it and write more optimized and just better code.
Hope nobody gets to level 24 :)
Mr. Murphy - I know it's your doing and I hate you
