Sand Castle Machine

Okay so this is a tower defence game where you build the tower. it is made 100% by me. just press escape or start to get all the controls you need.

and for those who need it, story context:

an alien race of orb like creatures exist, they are generally around 8cm in diameter. they have gained great technology, and this allows them to travel to new worlds. The orb we follow has a robotoid unit with her that has been built to protect her. she comes to this planet to see what its resources are like and to start a small colony. Soon after they get onto the planet's surface, the robotoid unit's sensors go off and it is found that a native race of monsters exist on this planet. They seek to destroy the orb creature. To defend herself she directs the robotoid unit to defend her while giving it resources to do so. 

go for as long as you can, there isnt an ending. The rounds get longer as you play.

Feedback is very appreciated.