In my opinion, the Rays of Doom, should only awaken their power when the bloons come out, because if I have more then one or two, it's hard to upgrade our towers with all those lasers on the screen.
What to do if I am near the dungeon teleport (where the yellow key is needed), but I didn't take the key. - I went right at first instead of going left for the key, and can't go left now because of a purple block (right nex to the hammer).
In my opinion the Start button is to close to the Delete button. I don't want to check it, so is there something like "Do you really want to delete this save"?