Tunnels & Trolls was one of the first FRPGs published, coming out in 1975. I owned both D&D and T&T in the late 70’s, and I found T&T to definitely be more to my liking of the two. You only need one type of dice, six-sided, and once you’re comfortable with the system you pretty much don’t need a rule book. I found it lent itself to more story.
T&T also spawned solo adventures with actual combat, you would roll dice to defeat opponents. LOTS of solo adventures were published, and this Kickstarter will include a couple.
Admittedly I am biased as I worked for T&T’s publisher, Flying Buffalo, and know all of the people involved. But it’s a good product, a good project, and a chance to get it as a PDF.