I really like the style of the game, but it's sometimes difficult to understand where I can go. Sometimes there is no visible wall but you can't pass through, and sometimes it's the opposite. Ennemy's projectiles help a lot to figure out that there is actually something there!
I also didn't understand at first that drone upgrades only apply to the next run. This makes the game much harder and a bit too time-consuming, especially when you have to restart from scratch.
I didn't manage to finish it. I collected around 115 blood, but I can't really progress beyond the first three rooms. :'(