Spunky

Main page found on https://spelunky.fyi/mods/m/spunky/
This is a mod for spelunky 2, which adds the following:

Player upgrades:
-Substantially reduced stun time
-Increased jump height
-Spawn with random weapon and powerpack
-Powerpack improved to not explode if equipped
Spelunky world changes:
-Increased overall monster spawns and traps
-Large percentage of monsters changed to be tougher types
-Travel from bottom to top for normal levels
-Abzu/CoG/Duat accessed through normal exits
-Tweaks to 1-4 for easy access to jungle or volcana
-Many olmecs 8)
-Access to CO possible without needing to do various Tun challenges
Checkpoint system:
-A quick restart after death will revert the player(s) to the beginning of the current biome/boss (does not carry over power-ups)
-Instant restart without death will restart the game to 1-1