TWLoader hasn't been supported for an extremely long time and has since been replaced with TWiLight Menu++
To answer a few questions, TWiLight Menu++ is a DS hypervisor that supports and plays DS games and it does come with a menu, cheats, etc. There is no chance of your system bricking and it's 100% safe.
It is now called "TwilightMenu++". And no. It is not an emulator. TWiLight Menu++ is an open-source DSi Menu upgrade/replacement for the Nintendo DSi, the Nintendo 3DS, and Nintendo DS flashcards. It can launch Nintendo DS, SNES, NES, GameBoy (color), GameBoy Advance, Sega GameGear/Master System & Mega Drive/Genesis ROMs, as well as DSTWO plugins (if you use a DSTWO) and .rvid videos using RocketVideo Technology.