Just great stuff. Wish there was more like this!
The art design was simple, but I think fit the gameplay well. It also scaled in difficulty really well, I felt. I especially like how the frogs remained the main problem throughout the game (though I guess there were two types of frog).
I like the basic idea of an attack that makes a problem worse before it makes it better. It didn't happen too often, but it was funny enough and when things got messy it required a bit of strategic thinking. Not too much, though, I guess, as it's a pretty simple game!
When healing was doled out was pretty crucial, and it all seemed very well timed and playtested. That's pretty rare for a free game on a portal like this!
Very much earned your 5 out of 5. If I had one suggestion, it be that maxed out energy regeneration include some form of autofire. Lots of clicking gets hard after a while.