Yeah I set it to windowed 1080p for avoiding some resolution problems at the last minute, sorry. I think you can press Alt+Enter to set to full screen. And the tutorial... IT IS COMPLETELY TRUE, everybody seems to have troubles with that, but not everybody told it to me, so I really thanks you a lot for telling it to me, it is VERY helpful.
There is even a useful wave bomb skill from minute one, and nobody knows that it exists hahahaha. I put a little explanation in the game page about it, but it's something that just few people have read.
Anyway, I am glad that despite this you had a good time :)