Take out the penalty for redoing stages. Give 100% blops for bloons you've killed already, not 1-in-3. The game would be grindy enough like that, the way it is currently is ridiculous.
I saved, came back, and loaded... all of the items purchased are there, but the state upgrades don't seem to be in affect anymore... candy is worth $1-2 each...
I liked the click to shoot backwards mechanic, and the enemy life gauges. But the levels are far too long, and the upgrade system has some really wonky price levels.
Just played around a bit... seems if your spell hotbar is full and you pick up a new spell, it puts the new spell in your inventory, but one of your spells on your hotbar will now cast the one you just picked up. Example, I picked up a haste spell with a full hotbar. I hit the spell to reveal the map, and it cast haste. Opened the inventory, took the reveal map spell off, put the haste spell in, then switched them back. Works fine.
Got to lvl 22 or 23... hit q to exit out to main menu and when i resumed the game was locked up... refreshed the page and had to start over at lvl 1, apparently my progress was corrupted... boooooooo