For four hours this is a pretty impressive entry to the jam, obviously it's a little hard to rate keeping that in mind while also keeping it fair to other games, but still, a pretty good submission based off that context. Honestly I've seen much worse that I believe had the full week. So I'm happy to see something this well put together in 4 hours.
There's not a lot to gameplay which makes sense with the time limit that you were under at the time., Although I do have to say it would've been a little nice if the plants maybe changed every run, or changed throughout the run. Just to mix it up a little, but it does seem like a lot of those four hours were put into the art so I can sort of understand it.
Overall, as a first jam this was a pretty well done project for sure. I'd be interested to see what would come out of a full week for a jam 100%.