I really like the idea, it's very unique. It gets a bit repetitive after a while though - just drag slimes to merge them. I think that bonuses dropping on the screen mid-game (that automatically spawn, you don't have to buy them) will make the game better. For example, look at "Bejeweled" - there are bonus gems with special effects that appear every once in a while.
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Thank you for that feedback and for playing.
Yeah perhaps something to spice it up would be nice, 35 rounds can drag on.
I really wanted coins and the items you get from the upgrades to keep it spicy as you track "The Nothing", with the slime upgrades taking over for the cool merge effects. Love to hear your ideas for some of the special effects that bejeweled like mechanics could do :).