Hi papes, thank you for the feedback

Indeed the game is challenging right from the beginning, although I also recommended to the client we should lower the number of enemies at least for the first 5-10 levels.
There is however an algorithm that increases the difficulty of the levels, which is represented by the health, type and number of enemies.
Related to the number of waves, we wanted to keep it a little bit mysterious, but I agree it should be better to know from the beginning (the answer is 10 btw

)