@plukers Without being too specific, the 'Main (intrinsict) goal' of the game is to get as many points as you can without losing all the energy from your spaceship, in order to accomplish that you get points and energy for every 'energy crystal' picked, if you fill your energy bar to 100% you open a portal to another planet. Every new planet gives you a points multiplier bigger than the previuos one, so it's correct to think to get to the new planet as soon as possible.
Everytime you picked and energy crystal, new energy crystals are spawned, also, 'bad crystal' (that depletes your energy bar) are spawned too, in order to balance the gameplay and make the game fit in the Challenge theme (Running out of space), also the planet shrinks itself a little bit every second.
About the repetitie gameplay, well, since is a short period of time for Game design, Development, Asset creation, Deployment, Community management and so on, we didn't had time to implement all the Game mechanics that we want, probably if the game has great reception from the community, we could keep adding interesting features to this game in the future.
I hope i have been helpful. Best Regards and thank you for playing our game, and we are really glad that you liked it! :)