Thanks a lot for the feedback, I am glad you liked it.
When you out of mana (blue bar below hp) you can't shoot, other then that you should be able to.
Tip for exp, you get exp for killing monsters, exp amount of monsters gradually increase every level (base exp * scene build index +1) :D
In normal gameplay if you kill enemies while running away, it took 5 minutes to become level 10+ (max level is 100 :D)
I am glad you liked the block rain, you can try to combo it with wind, it feels like a good combo to me :D