Excellent! Running a few one shots with it is my plan for the spring. The solo bosses do look like fun.
Did you find that PCs freeze up at all with so many action options, or folks tend to find it intuitive after a bit?
I used the action cards which seemed to keep things flowing really well. The players really liked the action cards and found "you have 3 actions to use per round" much more intuitive than D&D 2024's Bonus action, Move action, Action action, Reaction action deal.
Even my son, who doesn't want to play anything but D&D, admitted he loved the action cards and they made things much easier for him.
As a side note to show how confusing "actions" are in D&D, this weekend I participated as a player in (all adult) D&D game in which another player got really upset because she couldn't use their Shield Spell as a reaction since they had already cast a level spell on their turn earlier in the round. At first I thought the DM was wrong, but with a little thought I realized he was probably right since WOTC went out their way to ensure that you can only cast one levelled spell per round. And a quick internet search seemed to confirm.
In contrast in Nimble you get 3 actions you can use at any time for anything, and they get refreshed at the end of your turn. That's pretty simple. And if you use the cards you don't even have an issue tracking how many actions a person has used in a round already.
For me it fixes (so far) many of the issues I have with D&D 2024 and is simpler. I think it will be my default system for "D&D style" games in the future. Although I'm hoping to run Draw Steel when I get a change to run another campaign.
I'm currently running Welcome to the Hellfire Club! starter pack for my son and his friends. They love it because of the stranger things tie in, but you can see how difficult the system is for them (10-11 age range). But when I ran nimble over the holiday's my son participated and it was obviously easier for him. And he currently plays in 3 D&D 2024 campaigns a week, but to be fair he just started this past Fall so he doesn't have a ton of experience with the system.