Agreed, I've just discovered these and fixed these on my own. My pdxinfo looks like this now, and the game sideloads and is working with it:
name=Rail Gunner
author=4 gatti
version= 1.0.0
imagePath=images/meta_images
contentWarning=This game was made during PlayJam 9
pdxversion=30003
buildtime=824589740
buildNumber=1
bundleID=com.4gatti.RailGunner
I like, how they integrated different playdate inputs like shaking, cranking and dpad.
For the worse things, aside of the easily fixable package errors. - It would really help to make the aiming reticle more visible, especially for the revolver. I die after shaking, because I waste my time for searching the reticle on the screen.
Also the game is really punishing right now, at least for me. Some difficulty options or gradually scaling the difficulty - enemy speed over time would be nice.
In general, it's a promising game, which I would like to see in the catalog in the future, but it needs some polish.