What modifications are you proposing, other than adding enemies? What types of enemies will you add? These modifications should be significant and take some time to develop/create.
my changes would be to create a new enemy that shoots in bursts, and one that shoots in an “X” formation. The third would be to make all the levels be a maze where the player needs to run through and find non-hostile enemies that don’t shoot but follow the player to a “safe” location
