Nice! Controls and presentation are good, game all works well and the hack location reveal at the end looks nice (looks really cool in green, that space feels nice).
I wasn't quite sure what to do at the beginning, as it looked like enemies were constantly respawning and couldn't all be killed, so I instead I wandered off looking for the release node. An onscreen counter or something of remaining aliens to kill would fix this - it needs an indication that killing them is progressing toward a goal. Or, even just a sound effect could help sell this - something that sounds like a positive pickup sound when you kill them would also indicate positive progression. Also a mysterious reveal sound playing when the node location was revealed would feel good too - give that player a feeling they've accomplished something, and a hint there's something new to investigate.
All looks good so far. Nice beginnings to a cute little game and technical stuff all working.