Hello, thanks for the comment. There's an audio alert for its reload being finished - 4 "ticks" quickly play. Two minor quirks are that the rifle begins the level as loaded so you don't hear them in the beginning, and since your friend is the one reloading, the timer doesn't start until you put the rifle down.
I can see the audio cue not being very clear, as there are many other sounds playing or people's settings may be low. Would you have any suggestions for improving that feedback on a post-jam update?