That is a pretty interesting idea, but i have some critique points:
1. I liked the multiple jump system, but once you are up in the sky with a connection, you can´t get back down.
2. The artstyle isn´t really consistent, the astronaut looks pretty good, the battery and crytal look like beautiful drawings, the background looks awesome, the bullet is a standard unity sprite and so on and so on, but it doesn´t really fit together.
3. Try to use a different font than arial. That seems way more proffessional.
4. The controls are very inconvinient, it would be better if you move with A and D and jump with W, and then maybe make a connection with either the mouse or the space bar.
Hope the feedback helped you, would be nice if you could check out my game "Square Pair" too. :)