Just a picture of my run with this setups. I have a bit of a theory here...
Pst. Giant Light, you got a cord of the disc?
A strategy that I have worked out:
Tower upgrades: Fire Thumper, Ice Grenades with 2x firing speed, Fire Sprinkler, and half range 2x firing speed gun (optional). I also ran with larger pickup radius and other upgrades that made it so I didn't need to leave the tower.
Enemies: Just pick Blob. if you have to pick something else that isn't Blob past wave 20, be afraid. Blobs speed is based on their size. So keep that in mind.
Enemy upgrades: Focus on damage increases. If they are hitting your tower you aren't prepared enough. They will still gain speed and health later in the game and it will be your downfall.
Early game(waves 0-Redacted1): Grab the free upgrade somewhere on the map (not to far out). Spend this time preparing. There isn't much you can do other than that.
Mid game(Redacted1-2) Finish up your build and pray to Redacted that you get good luck with the 10% increases to range and fire rate. both of those are REQUIRED to survive 30+ waves. Also make sure you don't have to leave your tower, however you do it. At this point in the game the enemies should be faster and hit like a truck. Your thumper wont be killing them at this point. so make sure you have another way to deal damage or can slow them to a standstill.
Your demise(30+): Your death is imminent the amount of 10% increases you got will dictate how far you make it here.
Additional details: I won't lie, this is heavily RNG based. getting the wrong thing can end your run. That's why if you have read this far I BEG of you. Play how you want, this is a game that allows a good chunk of creativity, so abuse that and find your own game breaking strats. I also have yet to figure out what the upgrades do, so...
Be Not Afraid?
I appreciate the response. It's nice to see a developer active in their community. On another note, if you go directly down from the tower towards the bottom of the map you will run into a strange black square. I don't know if this some sort of intentional little thing or a bug. I haven't seen anyone else talk about it so I thought I would post it here.
Thumper with fire will easily carry you past wave 20 on its own. tri sprinkler with freeze works amazing to slow down normies who will be your primary threat. Weirdos and Boomers will end your game if you pick them so be wary. I only pick Blobs/normies, if There is no better option, hulk. if you only give the bad guys primarily damage buffs you should be able to make it far with a good setup. They will get too fast for thumper eventually so be ready to have something that will slow them.
Be not afraid.