I'm going to write a thorough review about this, which already shows that this is one of the best games that I have played this jam.
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The good:
When I started playing, I had read the first sentence of the description, yet I knew what I had to do. The limitation is used greatly and diversely. All guns have different play stiles and took a minute to figure out.
The bad:
The movement felt a bit weird and a jump would have been nice.
The ugly:
There is none because the art is beautiful yet simple.
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Lastly, I just want to say that I hope that this gets expanded with a couple more guns.