I like the concept and I really don't want to be that guy.. but I feel like the difficulty increases a lot compared to the amount of exp received in order to survive the next wave. Of course it's supposed to be challenging, but it might cause players to rage quit before even getting a good understanding of the game. A practice mode could be an option?
On a positive note, I really like the addition of a power bar and the variety of powers included (Q, W and E). With those, I suggest adding the option of not having to click to aim, whereas instead, when pressing the button Q button for example the arrow would fire in the direction of the cursor.
Lastly, the amount of exp earned per round seemed to vary a lot. When playing the first round, I seemed to receive between 150 to 250 exp. I wasn't sure if it was intentional (giving the game a luck factor) or not, but it seemed annoying mainly because exp is so precious at the beginning. :P
I still enjoyed it, and I look forward to any possible update! :)
(also I didn't notice any spelling mistakes :P)