First of all, congrats on making your first game. Second of all, the visuals look stellar; I love how this looks. Some small pieces of criticism:
The game doesn't increment in difficulty at all, so it is a little tricky getting in and then is very easy through the rest of the playthrough.
I think the game would feel more immersive and more satisfying if it had sound. Hearing the pressure increase and release on the cylinders, the lights flickering, and/or garbled alien speech when a new customer walks up would enhance the experience a bunch.
I think that the failure-condition should be clearly conveyed. After some testing, I found that failing to make three drinks make you lose, but I feel that that is something that should be conveyed from the outset. I also don't entirely understand what determines if you fail to make a drink (I initially thought that having the right cylinder on empty for too long is what did it but you can fail when it isn't empty) so I think that should be conveyed more clearly as well.
All critique aside, this was an enjoyable game to spend a few minutes on. You've done a good job.