As soon as the menu for upgrades popped up I thought "This looks like Idle Scratch-Off I played a while back". I played that through quite a few updates and enjoyed watching the progress, I look forward to seeing what comes of this!
I found a couple of bugs I'm sure have been mentioned before but you can completely skip getting the beach key at the end, and you can skip the entire last dungeon and go from the first room to the "master"...
Once you beat the game, beat the last level again (Where you start as the big defense one) and you get the Jack gene (+2 to all stats)...sequence that and restart the game, beat the last level twice again and you get another lol.
Way too easy but good concept. Just upgraded energy capacity first, then mini tesla and fork and only level I ran out of energy was the last. Could add more upgrades for more expensive, so you can't get all of them, like extra damage or defense, or more mini teslas.