The shots of him getting ready were definitely too quick - I get that you were going for a Dexter-esque approach to seeing his morning routine, but lengthening each shot by about half a second (or there abouts) would make it a lot better.
As the others mentioned, it doesn't really make sense for him to have been struggling to put the scythe into his
own car - surely he'd have used that car before? - and it did seem to go on for a bit too long.
It did seem a bit too improvised, the entire thing, which is reasonable seeing as you've said you did it with little to no pre-production. Certain things should have been lead up to a lot more though - for example, the golfing seemed just thrown in, because it occupied too little a space of time. The sudden change in tone to seriousness seemed very off, too, especially considering it goes straight back to comedic a few seconds later when he sees the guy behind the door. I'd suggest keeping the comedic tone throughout, for example showing a sigh of sadness when he's pulled out of his golf day to kill someone instead of deathly seriousness (no pun intended).
And you could tell you only have one suit for the grim reaper, by the way - those last few shots alternating between the door and the original reaper show quite a change in outfit. When he opens the door, the guy who knocked suddenly has a blue t-shirt on. Magic!
Saying that, it was a very nice ending, both in the way it's going to lead into another (hopefully) and that it was a perfect note to end on - the choice to carry on the sound of stirring tea was a particullarly nice one. The way he looked to his scythe and then to the new reaper was also probably my favourite part in the entire thing
There's definitely some potential here! It's a rather nice short film for one that had little to no pre-production, and with some proper planning I have no doubt you'll create something particularly hilarious!
It had a sort of Mr Bean vibe to it too, what with the silent characters and all that - you really don't see enough of that these days
