This game is alot of fun and has a suprising amount of depth and potential in spite of its simple premise. So many improvements could be made with just little itterations without really messing up the great gameplay cycle that the game already naturally has going on. Literally all you would have to do is implement stuff like;
-Unlockable permanent perks to the base status of your flubs like having all flubs spawn in with spikes
-unlockable flub cards
-hand size upgrades
-Upgradable Flub cards (AOE increasing, efficiency increasing)
-Greater enemy variety (Ranged enemies, Tanky enemies, bosses! etc)
-Unlockable Aquarium pets (insaniquarium style) that help you and your flubs out
-A Campaign with levels and a fun dumb story.
and I would actually happily spend money on this game. Wish this was actively being worked on because it has so much going for it.