Great game, but found a glitch
This is a great little game, with some conventions that are not out of Mario (plants not stopping when you stand next to them, not being about to stomp guys, and having to walk to stay on moving platforms), but highly enjoyable as a separate convention.
The Glitch: In one of the levels I hit the down arrow and I wound up not losing lives when I died.
-note: This happened until level 20, which may be because there's a stop all or a new scene or something, but you might want to check your script around levels 5-9 I think...