A nice concept! It's fun to jump between times in order to navigate obstacles that may or may not exist in both periods.
The action is pretty zoomed out, which is a gameplay benefit since the laser seems to have unlimited range, but it does also detract a bit from the feel of being part of the action. I felt I was mostly watching a tiny robot take down swarms of zombies and erratic automatons rather than being the tiny robot. It also made it difficult, at times, to notice small gaps in the fence needed to get to some of the artifacts.
The music is pretty cheery for a game about dealing with two desperate post-apocalyptic settings! The laser sound was comparatively quiet, which is perhaps a benefit since I chose to leave it firing most of the time. :D