Hi Vonhoon ,
Thank you , that means a lot!
The diagonal shooting was intentionally not possible, as I am a huge fan of The Binding Of Isaac, a game in wich you can only shoot in 4 directions, but maybe that wasnt the best choice for my game.
The game is pretty challenging indeed, maybe too challenging, but I think thats because the procedural generation can sometimes produce quite difficult maps. I need to tweak it a bit more so that it's less diffenrent from one map to another.
Anyway thanks again for the nice comment, I'm glad you enjoyed the game!