Its a strange and hastily made game using Construct 3, whereto shoot at aliens which approach you, sounds awfully similar. Plus the demo video is acting up so just click that link to a youtube video of it over there 👉...
How much experience does your group have? Does the project use anything (art, music, starter kits) you didn't create?
I have never really coded before so this was my first time making a game using Construct 3, In fact it was my first time making a game in general , the FAQ's and demos really got me through this one...