Heal8-Bit.ogg
A healing attack/item/spell.

Collision8-Bit.ogg
Bumping into a wall/NPC.

SmallExplosion8-Bit.ogg
A small explosion (for a gunshot or a popping balloon)

MediumExplosion8-Bit.ogg
A larger explosion (for things like dynamite and destructive spells)

Slash8-Bit.ogg
A slashing sound effect for swords and other sharp objects.

Crush8-Bit.ogg
A crushing sound effect. Made primarily for hammers and very large, wooden mallets.

ChargedSonicBoomAttack8-Bit.ogg
A sound effect for an attack/spell that charges and releases a sonic boom.

ChargedLightningAttack8-Bit.ogg
A sound effect for an attack/spell that charges and releases a wave of electricity on the enemy.

Metal_Hit.ogg
Something metallic hitting something else

Soft Airy Swish.ogg
A soft Airy swishing noise

BigWave.ogg
A water attack sound

EnemyDeath.ogg
A death sound for a minor enemy.

BossDeath.ogg
A Megaman-style death sound for a boss.

BigBossDeath.ogg
A death sound for a very powerful boss.

DrainMagic.ogg
A sound effect for a life-draining spell.

FlameMagic.ogg
A sound effect for a flame-based attack.

FreezeMagic.ogg
A sound effect for ice/water-themed spells.

FunkyZap.ogg
An odd sound effect for an electrical spell.

ThunderMagic.ogg
A sound effect for a powerful thunder/lightning spell.

StormMagic.ogg
A sound effect for a spell that creates a storm of some kind

TornadoMagic.ogg
A tornado spell, or maybe just a spinning attack?

KirbyStyleLaser.ogg
A laser "ping!" in the style of the Kirby games.

Death.ogg
Originally made as a sound for death magic, though you can probably think up other uses for it.

Powerup.ogg
A sound for a power-up attack of some kind.

Menu8-Bit.ogg
A sound effect for launching the Main Menu.

Select8-Bit.ogg
Sound effect for a moving the menu cursor.

Confirm8-Bit.ogg
Confirmation sound effect (for going into a submenu)

Cancel8-Bit.ogg
Cancel sound effect (for going back to the previous menu)

Thip.ogg
An alternate cursor-moving noise

TextboxBloop8-Bit.ogg
Sound effect for text appearing in a textbox.

UpStairs8-Bit.ogg
Walking up a staircase.

DownStairs8-Bit.ogg
Walking down a staircase.

Ping-da-ding-ding-ding.ogg
A pinging echoey sound.

Rolling Switch.ogg
A heavy rolling switch.

Rain.ogg
A loopable sound effect for rain (indoors version).

Rain2.ogg
A loopable sound effect for rain (outdoors version).

CreepyNoise.ogg
A strange, slightly creepy sound effect

RobotNoise.ogg
Sounds like something a robot or computer might make

ExtralongWarp.ogg
Someone warping in, warping out, warping someone else out... etc.

Fart.ogg
Just in case someone in your game needs to let one rip.

Oddbounce.ogg
A weird bouncy sound. A bit like the sound Zoras in the SNES Zelda make when they spit fireballs.