Your level is too conditional. At the very start, you have access to only one propeller cap. When you lose that, you've lost. Replace the block with a propeller pipe. Second, the ceiling in the next area. Those fire flowers have no point up there since it seemingly exists for the sole purpose of dropping spinies on your head. If there is a way up there, you didn't make it obvious enough. Next, the coin brick in front of the piranha plant stack. On its own, the stack is obnoxious, but the red koopa needs to be able to hit it. This can not be done if the player kicks the shell off the left side. Move the coin brick to the far left slope and compensate those ceiling spinies with a different enemy like green winged koopas or place a koopa spawner somewhere in there. Next, reduce the jump distance between that platform and the bloopers. It is too long to reliably jump off of an enemy with an unpredictable movement pattern. On its own, it should be a hazard, not a platform. Red winged koopas work better as reliable bounce platforms. I couldn't get past the winged spiny spike spam for many lives. There's a little too much going on there. There are a few spots past that that require one-time-use enemies. At the end, the propeller cap is only good for one jump up, which you're bound to get hit by the numerous bloopers. If you mess up here or at the spinies, you have to start over. I abused invincibility frames to bound through bloopers to get the flagpole.