Cute game!! And I really like the concept + character of the oids :D After spawning a few -oids I did end up with some serious lag, I think some of them got stuck or something because they also seemed to glitch around the screen a bit. They sure did enjoy that grass though...
Also, clicking the check-box spawns something right before the checkbox is enabled, which was a bit scary when I only meant to spawn one redoid and ended up with two and my population reduced by double what I thought!
Either way, very congratz on your first jam submission!!