Was there more to the tutorial after the lightning strike? I waited a while and then ended up pressing the skip intro button.
It would be also good to give the player an idea where the obelisk is because the map is quite large.
I didn't really feel like there were "waves" so much as a constant onslaught, my first go I made it to wave 4 and was surprised as I thought it was still wave 1. I also noticed that the wave counter was up to 2 before the first enemy arrived.
I also felt like in the tutorial the lightning blast hit all 3 little monsters in one shot but in the game it didn't seem to be as good or accurate. Not sure. Maybe I just wasn't as accurate due to the panicking.
Visuals and music were good