Well done!
I think the concept is very good. The laser having the ability to destroy blocks and healing stations is a good tie to the theme.
The environment looks so good too, with all the details like cables, plants and machines. One thing I would point out though, is that I think the background is a little too busy with some of the background tiles being just as prominent as the actual solid tiles. Sometimes it was hard to tell what was a solid tile and what was background. Maybe lowering the contrast between the colors on the background tiles would help.
I noticed some stutter the first time I shot the laser and the first time I hit some of the blocks I think it was. This makes me think this is caused by godot's shader caching (it also affects particles) and it is specially noticeable on lower-spec systems on web. What I usually do to avoid this stutter, is hide a subviewport containing these particles and shader materials behind a loading screen. The subviewport must be visible at some point for the shaders to be cached though, so I tend to make it tiny (2x2 px). When the loading screen fade out starts, the particles are "shown" for a split second, getting cached, while not really being visible to the player.
There might be other ways to go about it, but this has worked for me so far. You can look up Godot Shader pre-caching if you want to read more about it.
Other than that, nice job! I enjoyed playing your game!