So I've been quietly working away on future updates - I have the beginnings of a new game mode featuring procedurally generated levels (leave a comment if you have suggestions on the direction you'd like this to go!). In addition, I've made a lot of progress on implementing online multiplayer - it's a big task but maybe there will be a something to show - at least in beta form - within the next couple of weeks.
Thanks to everyone who's supported the game - don't forget to leave a review!