A very simple game that reminds me a lot of Flash games I used to play. I think it's a fun little game. The visual design is a little strange and inconcistant. It's strange to me that grass for some reason indicates elevators because to me grass is the most natural material for ground in the game. Maybe something like a steel beam might make sense.
Overall it's a nice little game which doesn't take too much thought. I'd look into creating some sort of a tile based system so you can create a level editor because those kind of things tend to work really well for these games.