As the other comments, I experienced this as the foundations of a much bigger project, which I will gladly play in the future as you work more on it. I love these types of games. Hope to watch you and this game grow together as game developer and game.
I don't have much to add to cmd16's comment, except that I really liked the ability to destroy the spikes! That was great, and for me quite novel, so I had more fun destroying the spikes than killing the enemies! I guess that fits in the destructible environment wildcard, so good job!