I surely enjoy exploring different genres, it's fun and refreshing! I also greatly appreciate your testing effort. (That level is hard but very interesting to know!)
For the luck aspect, I'm really nitpicking here as there is so much to like about the game. I guess a difficulty/accessibility setting as other participants have mentioned could ease it, because some levels are more of an action puzzle than a fast-paced shooter, and the core mechanic (efficiently defeating enemies within constraints of the terrain and the layout of objects) always stays fun no matter the timing windows or the game speed. Maybe an option to slow down the pace will encourage players to better revise and execute strategies instead of blindly wishing for luck. It's only my own idea and it may or may not be useful, but I write it out for reference. I find the game very enjoyable already!