Wow, thanks for the feedback! I am very pleased that you appreciated my game so highly <3 ! This game was made for a game jam, so I didn't have time to implement many ideas. I want to make a full-fledged game for 2-4 hours and release it on Steam. I don't have much time to develop the game yet, but I want to start in the near future.
As for the instructions...I have a low level of English, it seems to me that this is the case. I'll try to come up with something, but I can't promise that I'll make an update for this game.
The idea is that you kill an enemy and can take control of their body (the "ghost" or transparent enemy) and there can only be one ghost of each type of enemy on the map. This is a crude mechanic that solved many critical problems, so I left it that way. If there is no ghost or living enemy on the map, then this type of enemy will spawn after a while (yes, I know that the spawn time varies).