Twist angle modifies the band alignment, screening and interlayer coupling in twisted bilayers of transition metal dichalcogenides. Intermediate misorientation (twist angles θ > 15 ◦ ) bilayers offer a unique opportunity to tune excitonic behaviour within these concurrent physical mechanisms but are seldom studied. In this work, we measure many-body excitonic complexes in monolayer (ML), natural bilayer (BL) and twisted bilayer (tBL) WSe 2 . Neutral biexciton (XX) is observed in tBL for the first time, while being undetected in non-encapsulated ML and BL, demonstrating unique effects of disorder screening in twisted bilayers. The XX as well as charged biexciton (XX − ), are robust to thermal dissociation, and are controllable by electrostatic doping. Vanishing of momentum indirect interlayer excitons with increasing electron doping is demonstrated in tBL, resulting from near-alignment of Q − K and K − K valleys. Intermediate misorientation samples offer a high degree of control of excitonic complexes, while offering possibilities of studying exciton-phonon coupling, band-alignment, and screening.