How many runs did you try? The upgrades cost Dol, just my games form of currency or experience, which you'll have 0 when you start, but after your first run you should have plenty to buy a few upgrades. As for the control scheme I wasn't sure if clicking to move was the best option but I had been playing ARPGs for the past few weeks and it just felt right to me.
Top down games do exist with mouse clicks as movement, but with the rest of the control scheme, it just didn't feel natural at all. I kept accidentally clicking towards the enemies instead of using spells, and trying to select the magic just kept confusing me which finger to use and which button to press. I just ended up spamming the fire twice and still managed to die after only killing a few monsters.