i really like how you designed the levels. they had a nice difficulty curve and never felt overly difficult or unfair. the enemy design was also quite unique.
no idea how this game relates to reverse evolution.
i'd prefer if all the levels weren't available from the start and the player had to unlock them, but it's not a huge deal.
i had issues with the green spikes; they're very hard to distinguish from the grass. it would be nice if you made them stand out more.
good work with this! :D