No, no, no. I just finished a wave and my cursor happened to be right where "DONE" pops up. I didn't even get a chance to upgrade, then I died in the next wave and lost all my points. I had it on 3/5, but now it's a 1/5.
Just a quick loop I made in a few minutes.
http://www.team-atemis.com/notessimo/saved/200852142546881674.amhttp://www.team-atemis.com/notessimo/saved/200852142546881674.am