Energy recharge is way too slow. Using the basic shot, I spend most of my time waiting for energy to recharge even though I've spent points on int every level and have well over 100 int.
You should make it so the bosses actually drop items for the class of the player.. In the first 3 bosses I got items that were reallly strong but absolutely worthless since they weren't for my class.. and even if I get one on the 4th boss, I won't need it by then.
It's tough, but as for most people saying the heroes at the last level don't die.. they die pretty darn quick when fighting 30-40 hydras.. you just have to make sure you dig out most of the house things early on in the game then set up 7 interest things and it's pretty easy... you just spam the map with hydras and max their patrol range. Good game, fun badge.
Takes too long to get the badge.. I type 86 wpm so it's not a problem but then at 65k points, accidentally hit touchpad, lost focus and died. Don't feel like doing that over again.