I had on my to-do list some sort of minimap or little indication, where the buttons and power ups are, but due to the lack of time after work, I couldn't implement it. The second Screenshot I uploaded is the whole level from above. There are 5 power ups in total, two before the black/green enemy and three in the area behind him. You need both power ups to beat the "miniboss" and all five to beat the final enemy.