I've chosen all hard options and I (easily) won, I don't know if other people think this map is hard when you choose those modes, but it was for me.
Level 1-10 is pretty hard at the start, but as the game advances, a death tower halves the life of 4 of the creeps, that with the combination of the slow tower and mortar tower/lightning tower and you almost can't lose.
The descriptions are good, waves come up pretty fast (+1 sec), so you don't get bored while waiting for the next wave.
It isn't bad, it's a regular TD, no new options, or a new twist, but I like the normal TD's, so there's no problem there ^^
You just need to make the waves harder... (won't take much time).
Also continue working on your RPG (more than your TD), it's also pretty good